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  1. M

    Macintosh Classic Ram problem

    had the same problem once
  2. M

    Classic II strange problem

    Will replace the opto, have a number of them in stock. disconnecting the HDD is same result Does not explain that the board wih another analog board has the same problem. And another mainboard with both anolog boards is working ok..
  3. M

    Macintosh Plus display problem

    have you tried adjusting the brightness on the front?
  4. M

    Classic II strange problem

    Pressing the reset switch does not help. Tested the board yesterday again. tuned the voltage back to 12V and 5V (as close as I could get) installed a PRAM battery (empty don't have a charged one) Measured the voltages, go up to the 12v / 5v in seconds and stay stable (cool boot). Was...
  5. M

    Classic II strange problem

    checked the voltages at the hd power connector, 4.96V and 11.97V Boosted the voltages a bit to 5.08V and 12.20V problem seems to stay about the same. For the reset line, how do I check this?
  6. M

    Classic II strange problem

    am trying to repair a Classic II - replaced the capacitors on the mainboard and the analog board - removed U14 , cleaned underneath and replaced - removed egret , cleaned underneath and replaced - reflowed some connections problem is when I turn on the Classic II, the attached screen...
  7. M

    SE fdhd in need of screen adjustment

    Hi  thanks for your answer. Just for the record, the one you talk about is this one?
  8. M

    SE fdhd in need of screen adjustment

    Hi, I have a problem with a SE fdhd, the system is working ok, except for the screen. The top left corner seems to be lower than the right one. The overal picture is reasonably straight. In the second picture i have drawn a box around the screen so you can see the problem better. Can anyone...
  9. M

    Fixing a Macintosh Classic Rev. 2 Analog board (240V) that shows no signs of life

    Can confirm this, have a AB with no voltage on the secondary side, primary side seems ok, every component checks out, Replaced the capacitors on the secondary side did not fix it.   When I replaced the TDA4605 the board started working!!   This is the component I replaced:   This is another one...
  10. M

    Macintosh Classic (one) Analog Board Trouble

    RP2 is a surgistor, protects your mac by eliminating the destructive turn-on currents. You can measure it on the board has to be around 20 ohms The resistors in your picture are: RP1 22K 3W RP44 22K 0.25W RP13 100K RP14 220K RP18 220K RP19 220K RP46 470K looks like RP13 in your picture...
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